VT82C586A datasheet(21/43 Pages) ETC

21 / 43 page

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VT82C586A

Preliminary Revision 0.1 October 13, 1996

-15-

Configuration Space I/O

Mechanism #1

These ports respond only to double-word accesses. Byte or

word accesses will be passed on unchanged.

Port CFB-CF8 - Configuration Address .........................RW

Configuration Space Enable

Disabled .................................................default

Convert configuration data port writes to

configuration cycles on the PCI bus

30-24 Reserved

........................................ always reads 0

23-16 PCI Bus Number

Used to choose a specific PCI bus in the system

15-11 Device Number

Used to choose a specific device in the system

10-8 Function Number

Used to choose a specific function if the selected

device supports multiple functions

7-2

Used to select a specific DWORD in the device’s

configuration space

1-0

Fixed

........................................ always reads 0

Port CFF-CFC - Configuration Data ..............................RW

Refer to PCI Bus Specification Version 2.1 for further details

on operation of the above configuration registers.

VT82C586A Datenblatt(PDF) 21 Page - List of Unclassifed Manufacturers